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STOCK OPTIONS - Schedule of Nonvested Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Number of Shares |  |  |  |
Outstanding at beginning of year (in shares) | 331,560 | 334,400 | 334,400 |
Granted (in shares) | 19,000 | 15,000 |  |
Vested (in shares) | (7,000) | (6,000) |  |
Forfeited (in shares) | (16,400) | 0 |  |
Balance (in shares) | 327,160 | 343,400 | 331,560 | 334,400
Weighted-Average Exercise Price |  |  |  |
Outstanding at beginning of year (in USD per share) | $ 27.74 | $ 25.72 | $ 25.72 |
Granted (in USD per share) | 29.80 | 31.84 |  |
Vested (in USD per share) | 27.13 | 23.90 |  |
Forfeited (in USD per share) | 28.90 | 0 |  |
Balance (in USD per share) | $ 27.81 | $ 26.02 | $ 27.74 | $ 25.72
Weighted-Average Remaining Contractual Life in Years |  |  |  |
Outstanding | 7 years 7 months 9 days | 7 years 9 months | 7 years 9 months 7 days | 7 years 10 months 28 days
Granted | 9 years 10 months 24 days | 9 years 10 months 17 days |  |
Vested | 7 years 9 months 21 days | 8 years 1 month 24 days |  |
Forfeited | 8 years 5 months 26 days | 8 years 7 months 2 days |  |
Aggregate Intrinsic Value |  |  |  |
Outstanding | $ 975 | $ 1,673 | $ 1,673 |
Granted | 0 | 26 |  |
Vested | 22 | 56 |  |
Forfeited | 27 | 0 |  |
Outstanding | $ 807 | $ 2,508 | $ 975 | $ 1,673

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